package wwj;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.io.IOException;
import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

 



import wwj.entity.TupleEntity;
import wwj.entity.TupleEntity;
import wwj.reader.CsvReader;
import wwj.reader.TabReader;

/*
 *     hadoop jar /home/hadoop/桌面/boot.jar RecommendParse1 /work/output/BookLike/1/part-r-00000  /work/output/UsersMatrixParse2/10 /work/output/RecommendParse1/4

 */
public class RecommendParse1 {

	public static class MMapper extends
			Mapper<Object, Text, Text,TupleEntity  > {
		public static String uid="101294";
		public void map(Object key, Text value, Context context)
				throws IOException, InterruptedException {
			List<String> list = TabReader
					.readLine(value.toString());
			if(list.size()==3){
				TupleEntity entity=new TupleEntity();
				entity.setFlag(0);
				entity.setDouble1(Double.parseDouble(list.get(2)));
				String first=list.get(0);
				String sec=list.get(1);
				if(!first.equals(uid)&&!sec.equals(uid)) return ;
				if(first.equals(uid))  context.write(new Text(sec), entity);
				else  context.write(new Text(first), entity);
			}else{
				TupleEntity entity=new TupleEntity();
				entity.setFlag(1);
				entity.setText1(list.get(0));
				context.write(new Text(list.get(1)), entity);
			}
		}
	}

	public static class MReducer extends
			Reducer<Text, TupleEntity, Text, DoubleWritable> {
		public static String uid="101294";
		public void reduce(Text key, Iterable<TupleEntity> values,
				Context context) throws IOException,
				InterruptedException {
			if(key.toString().equals(uid)) {
				for(TupleEntity val :values)
				context.write(new Text(val.getText1().toString()),new DoubleWritable(-1000000) );
				return;
			}
			double factor=0;
			List<TupleEntity> list=new ArrayList<TupleEntity>();
			for(TupleEntity val:values){
				 if(val.getFlag().get()==0) {
					 factor=val.getDouble1().get();
				 }
				list.add(TupleEntity.copy(val));
			}
			if(Math.abs(factor)<1e-6) return ;
			for(int i=0;i<list.size();i++){
				TupleEntity val=list.get(i);
				 if(val.getFlag().get()==0) continue;
				 context.write(new Text(val.getText1().toString() ),new DoubleWritable(factor) );
					
			}
			 
			

		}
	}

	
	public static void main(String[] args) throws Exception {
		Configuration conf = new Configuration();
		String[] otherArgs = args;
		if (otherArgs.length < 2) {
			System.err.println("Usage:  <in> [<in>...] <out>");
			System.exit(2);
		}
		Job job = new Job(conf, "RecommendParse1");
		job.setJarByClass(RecommendParse1.class);
		 
		job.setMapperClass(MMapper.class);
		 
		job.setReducerClass(MReducer.class);
		job.setMapOutputKeyClass(Text.class);
		job.setMapOutputValueClass(TupleEntity.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(DoubleWritable.class);
		 
		for (int i = 0; i < otherArgs.length - 1; ++i) {
			FileInputFormat.addInputPath(job,
					new Path(otherArgs[i]));
		}
		FileOutputFormat.setOutputPath(job, new Path(
				otherArgs[otherArgs.length - 1]));
		System.exit(job.waitForCompletion(true) ? 0 : 1);
	}
}
